The circuit shown at right represents a simple strobe light whose (flash frequen

Question

The circuit shown at right represents a simple strobe light whose (flash frequency) can be

easily adjusted. The circuit consists of a battery (emf?=100Vand internal resistance r=3 ohms), a variable resistor R, a capacitor C = 5x10^-6 F, and a fluorescent lamp L.

There is a current through the lamp only when the potential across it reachesVL=90V,the breakdown voltage; then the capacitor discharges (instantaneously and completely)through the lamp causing it to flash. (The lamp has negligible capacitance and resistance.)

(a) To what value should you tune R so that the lamp flashes 4.00 times per second? How important is the internalresistance of the battery?

(b) Sketch V(t), the voltage across the capacitor (or equivalently the lamp) as a function of time, from t=0 s

to t=1 s. Clearly label your plot, including the maximum values for V(t).

Explanation / Answer

where is the circuit

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